Long scan times but short host scan times, what is the issue?

I have a scan of 11 or so assets that will take multiple 8-hour segments to complete. The scan will start at midnight and pause at 8 am. It took four 8-hour segments to scan 5 of the 11 assets. The thing that is strange and I can't figure out, is the Host Scan Time QID for the scanned assets is only about 10-15 minutes. Does anyone know what might be causing this or what I should look into?